add_module_alias

# File lib/rdoc/context.rb, line 529
  def add_module_alias from, from_name, to, file
    return from if @done_documenting

    to_full_name = child_name to.name

    # if we already know this name, don't register an alias:
    # see the metaprogramming in lib/active_support/basic_object.rb,
    # where we already know BasicObject is a class when we find
    # BasicObject = BlankSlate
    return from if @store.find_class_or_module to_full_name

    unless from
      @store.unmatched_constant_alias[child_name(from_name)] = [to, file]
      return to
    end

    new_to = from.dup
    new_to.name = to.name
    new_to.full_name = nil

    if new_to.module? then
      @store.modules_hash[to_full_name] = new_to
      @modules[to.name] = new_to
    else
      @store.classes_hash[to_full_name] = new_to
      @classes[to.name] = new_to
    end

    # Registers a constant for this alias.  The constant value and comment
    # will be updated later, when the Ruby parser adds the constant
    const = RDoc::Constant.new to.name, nil, new_to.comment
    const.record_location file
    const.is_alias_for = from
    add_constant const

    new_to
  end